Nearly all gasoline sold in the U.S. contains up to 10 percent of ethanolâ€”a corn-based liquid often added to gasoline. As a renewable fuel ethanol reduces the amount of petroleum-based gasoline on the market and many farmers receive subsidies to grow corn for the biofuel. But now the Environmental Protection Agency is considering a reduction in the required amount of ethanol for the country's gasoline supply.Â Harvest Public Media's Ames-based reporter Amy Mayer and host Ben Kieffer discuss the future of ethanol in the U.S.